Tuyere construction



Feb. 3, 1931. R. A. FORESMAN ET AL 7 1,791,269

TUYER'E CONSTRUCTION Filed April 5, 1930 ATTORNEY Patented Feb- 3, 1931 UNITED STATES PATENT OFFICE ROBERT a ronnsuan, or uoonizs; ANDIDONiALD .1. mossnanr, or LANsnowNE; PENN- SYLVANIA, ASSIGNOBS '10 WESTINGHOUSE ELECTRIC AND MANUFACTURING COH- PANY, A CORPORATION 01' -PENN SYLV ANIA 'ru'nmn consrmfc'rron Application filed April 3,

My inventionrelates to underfeed stokers and more particularly to the so-called tuyere blocks for such stokers, and it has for an object to provide a tuyere block of improved construction.

In apparatus of this character heretofore known to me, particularly the downwardlyinclined, multiple-retort underfeed stoker, it is usually the practice to provide adjacent the retorts, a fuel-supporting and, air supplying means consisting of a plurality of hol-' low tuyere blocks disposed in overlapping, stacked relation and supported by the walls of the retort. The tulyeres are usually provided with spaced, ownwardly-extending flanges or fins which rest uponthe up er surface of the tuyere therebelow and de ne separate uninterrupted passages for the air flowing from the interior tothe exterior of, the tuyere.

Difliculty has been experienced in the use of the prior art constructions for the reason that the air flowing through the tuyere does not absorb sufficient heat to efiectively prevent the sticking of molten clinker and ash to the upper surface thereof.

More particularly, therefore, it is an object of this invention to provide a hollowv tuyere block for underfeed stokers, which is so constructed as to provide a multitude of tortuous passages for the air flowingto the fuel bed,

so that such air will come into intimate contact with relatively largeareas of the tuyere structure and thereby moreefie'ctively absorb heat therefrom. V

These and other objects are efl'ected by my invention, as will be apparent from the following-description and claims, takeniin con nection with the accompanying drawings, forming apart of "this application, in which:

Fig. 1 is a j fragmentary view, 1 partially sectional and partially side, elevational, ofja row-of tuyeres constructed in. accordance with the present invention;

Fig. 2 is a fragmentary plan view f a=-row oftuyeres and showing also, adjacent portions of the retorts Fig. 3 is a bottom plan view of three of:

the tuyeres in assembled relation;

1930. Serial No. 441,297.

strengthening the same, side .portions depending from the forward lateral edges of the body, and a plurality of rows of 'frustoconical-shaped projections depending from the side and rear portions of the body and being so arranged that the projections of one row are disposed in staggered relation with respect to the projections of an adjacent row, thereby providing a multitude of interconnected, tortuous passages for conveying the air from the interior of the tuyere block.

By "reason of this construction,it is necessary for the air to come into intimate contact with a number of the projections before reachin the fuel bed, thereby resulting in a relative y greater amount of heat absorption by the air, and a relatively cool tuyere block.

Referring now in detail to the construction illustrated, it is to be observed that I have shown,.in.Figs. 1 and 2, a plurality of integrally-cast, hollow tuyere blocks 10 arranged -in-overlapping, stacked relation, and supported "by the upper edges of side walls 11 of adjacent retorts 12 of a downwardly-inclined multiple-retort underfeed stoker. Air is supplied to the s ace between the retort sides 11.- b any suita le means, not shown, and this air ewsupwardlyinto the tuyere blocks and outwardly through passages provided in the tuyere'blocks, andinto the fuel bed'for supporting combustion.

. Thetuyere'blocklo comprises a relatively thinpplate-likebody 13, side portions 14 dendi ng from the rear lateral edges of the ody and. engaging the upper surfaces of the retort side walls 11, and'a plurality of frustoconical-shaped projections 15 depending i from the side and rear portions of the body 13 and engaging the u per surface of the tuyre therebeneath; The body is provided with a centrally-arranged, long-ltudmall -extending slot 16having a. rein orcing ri 17.

of the side walls 11, to hold the tuyres in place. The remaining tuyres 10 are provided at their rearmost ends with downwardly-extending projections 21 which engage-the rear end of the tn lire l0 thereheneath (see particularly Fig.3

Referring now in detail to Figs 4 and 5, the

frusto-conical-shaped projections 15 arearranged in rows indicated by the reference? characters 15a, 15%, 15c, 15d and 15a, and the projections of any one oi the rows are dll$= posed in staggered relation with res ect to the projections of adjacent rows, there y providing a plurality of inter-connected tortuons passe for the air flowing from the in (ill till

terior of the tnyere hlocl: to the exterior there A oi. By reason of this construction, it will The necessary for the air flowing through the tnytre to come into intimate contact with the sides of the projections 15, therehy providing for the efiective transmission of heat from the tnyere loloclr to the air,

n view of the shove description and accompan ing drawings, it will he readily seen that l ave provided a relatively simple, rugged and inexpensive tuyere l'JlG'PlQ'WhiCh is maintained at all times in a relatively cool condition hy the air ilowing therethrough. Furthermore, lay reason of the fact that the tuyiare lolochs are relatively thin 1n construe tion, an extremely large area of air openings is provided per unit length of retort, a I

While wehave shown our invention in lent one form, it will he ohvions to those skilled in the art that it is not so limited, hnt is sns ceptilole of various changes and modifications without departing from the spirit thereoi', and we desire, therefore, that only such limitations shall he laced thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What we claim is:

1. An integrally-cast hollow tnyere liloclr comprising a relatively thin, plate-hike hody, and a plurality of separate pro ections depending from the lateral and rear portions of the plate and so arranged as to provide a multitude or interconnec' t rtuous an passages connecting the interior of mg with the exterior thereof.

2. An integrally-cast hollow tuyre block the castcomprising a re1atively.thin,(plate-like body,

a wrought metal piece embe ded within the body for strengthening thelatter, and a plurality of separate projections depending from the lateral and rear portions of the plate and plate-like body, side portions depending from the forward lateral edges of the body, and a plurality oflseparate projections depending from the side and rear portions of the body and so arranged with respect to one another as to define a multitude of interconnected tortuous air passages connecting the interior of the tuyere with the exterior thereof.

d. A hollow tuyre block for underfeed stokers adapted to be arranged in overlapping relation with similar tnyere blocks to provide a fuel-supporting and air-supply, ing means, and comprising, in combination,

a plate-like body, side portions depending from the forward lateral edges of the body,

a plurality of separate projections dependin from the side and rear portions of the body and so arranged with respect to one another as to'definea multitude of interconnected tortuous air passages connecting the interior of the tnyere with the exterior thereof, and

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strengthenin means ernhedded within the plate-lilac 11 y.

5. A hollow tnytre .hloch for nnderleed stokers adapted to he arranged in overlapping relation. with similar tnyere loloclrs to provide a incl-supporting and air-supply mg means, and comprising, in combination, a plate-hire body, side portions depending fro the forward lateral ed es of the body, and a plurality of rows oi irnsto-conicalshaped projections dependin from the side and rear portions of the ho y and losing so arranged that the projections of one row are disposed n staggered relation with respect to the pro ections of an adjacent row, therehy providing a plurality of tortnons air passages connecting the interior of the tnyere with the exterior thereof.

tit-A hollow tnyere hloclr for nnderteed stohers adapted to he arranged in overlapping ation with similar tnyere lolochs to provide a fuel-en porting and air-snpplying means, and comprising, in conihination, a plate-like loody, side portions depending fromthe toward lateral edges of the hody, a plurality of rows of frnsto conicals-shaped projons depending from'the side and rear lOd lld

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portions of the body and so arranged that the projections of one row are disposed in staggered relation with respect to the projections of an adjacent row, thereby providing a plurality of tortuous air passages connecting the interior of the tuyere with the exterior t ereof, and strengthening means embedded within the plate-like body. 1

7. A hollow tuyere block for underfeed stokers adapted to be arranged in overlapping relation with similar tuyere blocks to provide a fuel-supporting and air-supplying means, and comprising, in combination, a plate-like body having a centrally-arranged, longitudinally-extending slot, side portions depending from the forward lateral edges of the body, a plurality of separate projections depending from the side and rear portions of the body and so arranged with respect to one another as to define a plurality of tortuous air passages connecting the interior of the tuyore with the exterior thereof, and a locking lug extending downwardly from the plate-like "body and adapted to extend through the centrally-arranged slots of the tuyeres arranged therebeneath.

n testimonywhereof, we have hereunto sglggcribed our names this 31st day of March, 1

ROBERT A. FORESMAN. DONALD, J. MOSS HART. 

